HALL ELECTROMOTIVE FORCE SIGNAL DETECTION CIRCUIT AND CURRENT SENSOR THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a Hall electromotive force signal detection circuit in which offset canceling means using a spinning current technique of a Hall element is combined with a continuous time signal processing circuit.SOLUTION: A first Hall element 13 including first to fourth terminals generates one Hall electromotive force signal voltage Vhall1, and a third Hall element 15 generates another Hall electromotive force signal voltage Vhall3. A first switching circuit 14 selects a position of a terminal conducting a drive current out of four terminals of the first Hall element 13, and a third switching circuit 16 selects a position of a terminal conducting a drive current different from that selected by the first switching circuit 14 out of four terminals of the third Hall element 15. A chopper clock generation circuit 11 supplies chopper clock signals having two different phases to switching circuits 14 and 16.